/* ============================================
   Design Kit — Mobile App Design System
   ============================================ */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
  /* Colors */
  --color-primary: #003CBE;
  --color-secondary: #37DCCC;
  --color-white: #FFFFFF;
  --color-neutral: #9197AD;
  --color-bg: #F3F7FF;

  /* Semantic colors */
  --color-text: var(--color-primary);
  --color-text-muted: var(--color-neutral);
  --color-text-inverse: var(--color-white);
  --color-border: rgba(145, 151, 173, 0.3);
  --color-error: #E53935;
  --color-success: var(--color-secondary);

  /* Typography */
  --font-family: 'Montserrat', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Font sizes (mobile-first) */
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem;   /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem;  /* 20px */
  --font-size-2xl: 1.5rem;  /* 24px */
  --font-size-3xl: 2rem;    /* 32px */
  --font-size-4xl: 2.5rem;  /* 40px */

  /* Font weights */
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Line heights */
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.6;

  /* Spacing */
  --spacing-xs: 0.25rem;  /* 4px */
  --spacing-sm: 0.5rem;   /* 8px */
  --spacing-md: 1rem;     /* 16px */
  --spacing-lg: 1.5rem;   /* 24px */
  --spacing-xl: 2rem;     /* 32px */
  --spacing-2xl: 3rem;    /* 48px */

  /* Border radius */
  --radius-button: 50px;
  --radius-form: 16px;
  --radius-card: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 60, 190, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 60, 190, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 60, 190, 0.12);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.25s ease;
}

/* --- Base Reset --- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* --- Typography --- */
body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 {
  margin: 0 0 var(--spacing-md);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  color: var(--color-primary);
}

h1 {
  font-size: var(--font-size-3xl);
  font-weight: 700;
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

p {
  margin: 0 0 var(--spacing-md);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
}

a:hover {
  color: var(--color-secondary);
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.caption {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-regular);
}

.label {
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  font-family: var(--font-family);
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-base);
  border-radius: var(--radius-button);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  min-height: 48px;
  padding: 0 var(--spacing-lg);
}

.btn:focus {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

/* Primary */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.btn-primary:hover {
  background-color: #002a8a;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

/* Secondary (accent) */
.btn-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.btn-secondary:hover {
  background-color: #2bc4b8;
  transform: translateY(-1px);
}

/* Outline */
.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn-outline:hover {
  background-color: rgba(0, 60, 190, 0.08);
}

.btn-outline-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-outline-secondary:hover {
  background-color: rgba(55, 220, 204, 0.1);
}

/* Chip / Quick select */
.btn-chip {
  background-color: var(--color-bg);
  color: var(--color-primary);
  border-color: transparent;
}

.btn-chip:hover {
  background-color: rgba(0, 60, 190, 0.08);
}

/* Sizes */
.btn-sm {
  min-height: 36px;
  padding: 0 var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  min-height: 56px;
  padding: 0 var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
}

/* --- Forms --- */
.form-group {
  margin-bottom: var(--spacing-lg);
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  padding: var(--spacing-md);
  border: none;
  border-radius: var(--radius-form);
  background-color: var(--color-white);
  color: var(--color-text);
  transition: box-shadow var(--transition-fast);
}

/* Контактная форма: инпуты белые без обводок */
.form-contact .form-input,
.form-contact .form-select,
.form-contact .form-textarea {
  border: none;
  background-color: var(--color-white);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-text-muted);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  box-shadow: 0 0 0 3px rgba(0, 60, 190, 0.15);
}

.form-contact .form-input:focus,
.form-contact .form-select:focus,
.form-contact .form-textarea:focus {
  box-shadow: 0 0 0 3px rgba(0, 60, 190, 0.15);
}

.form-input.error,
.form-select.error {
  box-shadow: 0 0 0 2px var(--color-error);
}

.form-contact .form-input.error,
.form-contact .form-select.error {
  box-shadow: 0 0 0 2px var(--color-error);
}

.form-error {
  margin-top: var(--spacing-xs);
  font-size: var(--font-size-xs);
  color: var(--color-error);
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239197AD' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--spacing-md) center;
  padding-right: 2.5rem;
}

.form-textarea {
  min-height: 120px;
  resize: vertical;
}

/* Checkbox */
.form-checkbox {
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-md);
  cursor: pointer;
}

.form-checkbox input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--color-primary);
  flex-shrink: 0;
}

.form-checkbox .form-checkbox-label {
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

/* Radio */
.form-radio {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  cursor: pointer;
}

.form-radio input {
  width: 20px;
  height: 20px;
  margin: 0;
  accent-color: var(--color-primary);
}

/* --- Cards --- */
.card {
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-normal);
}

.card.form-contact {
  background-color: #F3F7FF;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card-header {
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.card-title {
  margin: 0;
  font-size: var(--font-size-lg);
}

.card-body p:last-child {
  margin-bottom: 0;
}

/* Card variants */
.card-elevated {
  box-shadow: var(--shadow-md);
}

.card-interactive {
  cursor: pointer;
}

/* Card with blue header (app style) */
.card-header-blue {
  padding: 0;
  overflow: hidden;
}

.card-header-blue .card-header {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-lg);
  margin: 0;
  border: none;
  border-bottom: none;
  border-radius: var(--radius-card) var(--radius-card) 0 0;
}

.card-header-blue .card-header .card-title {
  color: var(--color-white);
  font-weight: var(--font-weight-semibold);
}

.card-header-blue .card-body {
  padding: var(--spacing-lg);
}

/* Card layered: два прямоугольника (синий + белый) со смещением + кружок */
.card-layered {
  position: relative;
  padding: 0;
  overflow: visible;
  background: transparent;
  box-shadow: none;
}

/* Синий прямоугольник — верхний слой */
.card-layered::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 64px;
  background-color: var(--color-primary);
  border-radius: var(--radius-card) var(--radius-card) 0 0;
  z-index: 0;
}

/* Белый прямоугольник — смещён вниз, накладывается на синий */
.card-layered .card-layer-white {
  position: relative;
  z-index: 1;
  margin-top: 20px;
  background-color: var(--color-white);
  border-radius: var(--radius-card);
  padding: var(--spacing-lg);
  padding-top: calc(var(--spacing-lg) + 8px);
  box-shadow: var(--shadow-md);
  overflow: visible;
}

/* Декоративные фигуры в правом верхнем углу белого */
.card-layered .card-decor {
  position: absolute;
  top: 0px;
  right: 10px;
  width: 132px;
  height: 73px;
  z-index: 0;
  pointer-events: none;
}

.card-layered .card-decor svg {
  width: 100%;
  height: 100%;
}

.card-layered .card-layer-white .card-body {
  position: relative;
  z-index: 1;
  padding: 0;
}

.card-interactive:hover {
  box-shadow: var(--shadow-lg);
}

/* --- Badges --- */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 20px;
  height: 20px;
  padding: 0 6px;
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  border-radius: 10px;
  line-height: 1;
}

.badge-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.badge-secondary {
  background-color: var(--color-secondary);
  color: var(--color-white);
}

.badge-neutral {
  background-color: var(--color-neutral);
  color: var(--color-white);
}

.badge-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

/* --- Icons --- */
.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: inherit;
}

.icon-sm {
  width: 16px;
  height: 16px;
}

.icon-lg {
  width: 32px;
  height: 32px;
}

/* Icon SVG styles */
.icon svg {
  width: 100%;
  height: 100%;
  fill: currentColor;
  stroke: currentColor;
}

/* --- Utility Classes --- */
.text-primary { color: var(--color-primary); }
.text-secondary { color: var(--color-secondary); }
.text-muted { color: var(--color-text-muted); }
.text-white { color: var(--color-white); }

.bg-primary { background-color: var(--color-primary); }
.bg-secondary { background-color: var(--color-secondary); }
.bg-white { background-color: var(--color-white); }

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* --- Responsive (Desktop) --- */
@media (min-width: 768px) {
  :root {
    --font-size-3xl: 2.5rem;
    --font-size-4xl: 3rem;
  }
}